Code style #130 (#132)

This closes #99.

Aga.Controls/StringCollectionEditor.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.ComponentModel.Design;
+
+namespace Aga.Controls
+{
+	public class StringCollectionEditor : CollectionEditor
+	{
+		public StringCollectionEditor(Type type): base(type)
+		{
+		}
+
+		protected override Type CreateCollectionItemType()
+		{
+			return typeof(string);
+		}
+
+		protected override object CreateInstance(Type itemType)
+		{
+			return "";
+		}
+	}
+}